NAC was designed to predict the neutron-induced gamma-ray radioactivity for a wide variety of composite materials. The NAC output includes the input data, a list of all reactions for each constituent element, and the end-of-irradiation disintegration rates for each reaction. NAC also compiles a product isotope inventory containing the isotope name, the disintegration rate, the gamma-ray source strength and the absorbed dose rate at 1 meter from an unshielded point source. The induced activity is calculated as a function of irradiation and decay times; the effect of cyclic irradiation can also be calculated.

Each composite material may consist of up to 20 different elements and up to 20 different decay times may be included. Both limits may be increased by the user by increasing the appropriate items in the DIMENSION statement.

The code was originally designed to run on the IBM 7094 with standard I-O equipment and it was converted to be operable on the IBM 360/75/91, the IBM 3033 and also on the CDC 7600. The new PC version will run on most PC's with or without a math co-processor.

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NEA-DB installed the program on a DELL 466/L PC/80486 (66 MHz) with 8 MBytes of RAM.

The packaged codes are operable on the IBM OS/VS2 operating system using the VS Fortran compiler with the language level 55 option and on the CDC 7600 FORTRAN IV systems.
For the PC version, MICROSOFT FORTRAN Version 4.01 was used for compilation and linking under DOS 3.3 operating system.

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NEA-DB installed and ran the program under MS-DOS Version 6.2 using the FORTRAN-77 compiler Lahey F77L-EM/32 Version 5.20.